Design and Performance of Rechargeable Sodium Ion Batteries, and Symmetrical Li-Ion Batteries with Supercapacitor-Like Power Density Based upon Polyoxovanadates
Design and Performance of Rechargeable Sodium Ion Batteries, and Symmetrical Li-Ion Batteries with Supercapacitor-Like Power Density Based upon Polyoxovanadates
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基于多钒酸盐的可充电钠离子电池和具有类似超级电容器功率密度的对称锂离子电池的设计和性能
DOI：
10.1002/aenm.201701021
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发表时间：
2018-02-26
影响因子：
27.8
通讯作者：
Dong, Quan-Feng
中科院分区：
文献类型：
--
作者：
Chen, Jia-Jia;Ye, Jian-Chuan;Dong, Quan-Feng
聚阴离子Li7V15O36（CO3）是一种纳米大小的分子簇（尺寸约为1nm），具有形成比传统过渡金属氧化物电极材料具有更高表面体积比的开放主体框架的潜力。本文以多氧钒酸盐Li7V15O36（CO3）为材料，研究了实用的可充电钠离子电池和对称锂离子电池。{V15O36(CO3)}中的钒中心并不都具有相同的V- iv /V氧化还原电位，这使得这种材料可以制造出具有类似电池的能量密度和类似超级电容器的功率密度的对称器件。在100a g（-1）下，可以实现51.5 kW kg（-1）的超高比功率和125 W h kg（-1）的比能量，以及长循环寿命（>500次循环）。此外，电化学和理论研究表明，{V15O36(CO3)}还可以运输Na+等大型阳离子，并且可以作为可充电钠离子电池的正极材料，具有240 mA h g（-1）的高比容量和390 W h kg（-1）的比能量。最后，这些电化学储能装置中的多金属氧酸盐材料可以通过简单的水处理很容易地从废电极中提取出来，为氧化还原活性材料的循环利用提供了一条潜在的途径。
The polyanion Li7V15O36(CO3) is a nanosized molecular cluster (approximate to 1 nm in size), that has the potential to form an open host framework with a higher surface-to-bulk ratio than conventional transition metal oxide electrode materials. Herein, practical rechargeable Na-ion batteries and symmetric Li-ion batteries are demonstrated based on the polyoxovanadate Li7V15O36(CO3). The vanadium centers in {V15O36(CO3)} do not all have the same V-IV/V redox potentials, which permits symmetric devices to be created from this material that exhibit battery-like energy density and supercapacitor-like power density. An ultrahigh specific power of 51.5 kW kg(-1) at 100 A g(-1) and a specific energy of 125 W h kg(-1) can be achieved, along with a long cycling life (>500 cycles). Moreover, electrochemical and theoretical studies reveal that {V15O36(CO3)} also allows the transport of large cations, like Na+, and that it can serve as the cathode material for rechargeable Na-ion batteries with a high specific capacity of 240 mA h g(-1) and a specific energy of 390 W h kg(-1) for the full Na-ion battery. Finally, the polyoxometalate material from these electrochemical energy storage devices can be easily extracted from spent electrodes by simple treatment with water, providing a potential route to recycling of the redox active material.